Question

Solve the following system of equations by linear combination:
3d-e=7
d+e=5

The solution is (3,2).
There are an infinite number of solutions.
There is no solution.
The solution is (2,-1).

Answer 1

adding the 2 equations will eliminate e

then you can solve for d

when you get d, substitute it into either equation to find e.

hope this helps you get the answer

Answer 2

Thank you.